[Kenwood] Kenwood TS-850 DC-DC Board

[Maciek SQ6MS]

Thanks for pointing that out Cliff
Of course its better to use LTC chip.
Mine ICL7660 works just fine with litlle trick (for experiment)
Supply voltage must be at least 12 V to achieve -6V at the output
so i just reduce the V+ current a litlle bit trying no to exceed
power dissipation of the plastic dip housing of this chip. Without
reducing current it will work also and you have still some margin.
If it blows up i will let you (group) know. Time since this mod
in my case is 1 year (pretty nothing for semicoductor hi) without any 
problem.
So kids you can try it at home but beware!
And sorry for my pure lid`ism

-- 
Vy73 de Maciek ... --.- -.... -- ...

p.s. I think that guys from Yamada (?) use pins that comes from
some of the old broken IC`s



W dniu 2012-01-02 21:45, Clif Holland pisze:
> The ICL7660 is listed as 10.5VDC MAX supply
>
> Clif Holland KA5IPF
> www.avvid.com
>
>
>
>
> ----- Original Message ----- From: "Maciek SQ6MS" <sq6ms at o2.pl>
> To: <kenwood at mailman.qth.net>
> Sent: Monday, January 02, 2012 1:52 PM
> Subject: Re: [Kenwood] Kenwood TS-850 DC-DC Board
>
>
>> Nice mod that solves the problem with DC-DC board far below $ 21.81 :
>>
>> http://homepage2.nifty.com/yamada_radio_clinic/archive/850_dc_dc/850dcdc.htm
>>
>>
>>
>> You can also use ICL7660 instead of LTC1144.
>>
>>
>> --
>> Vy73 de Maciek ... --.- -.... -- ...
>>
>>
>>
>> W dniu 2012-01-02 19:11, Mike Rhodes pisze:
>>> I am considering ordering the DC-DC board from Pacific Parts just so I
>>> have one before they become unavailable. However, the part is $10.31 and
>>> S&H is $11.50! Anything else I should consider ordering to make the S&H
>>> a little more tolerable?
>>>
>>> Mike / W8DN
>>>
>>> On 1/1/2012 1:14 PM, k0bx at arrl.net wrote:
>>>> Hi Mark, this is a common problem with the TS-850. The replacement
>>>> board cost
>>>> about $11.00.
>>>> My website has detail instructions on this problem.
>>>>
>>>> http://qsl.net/k0bx/ts850flu.htm
>>>>
>>>> Hope this helps.
>>>>
>>>> Joe K0BX
>>>> Stop the insanity!
>>>> Please do not add me to any distribution lists (Joke, Stories or
>>>> Junk) without
>>>> my permission.
>>>>
>>>>
>>>>
>>>>
>>>> ________________________________
>>>> From: W1ZC<W1ZC at myfairpoint.net>
>>>> To: Mark<w4tgb at charter.net>; kenwood at mailman.qth.net
>>>> Sent: Sun, January 1, 2012 1:44:01 AM
>>>> Subject: Re: [Kenwood] Kenwood TS-850
>>>>
>>>> Most likly the DC-DC converter board failing. Common (one of few)
>>>> problem.
>>>> Replacement available from Kenwood parts.
>>>> Cheers, Dick
>>>>
>>>> -----Original Message-----
>>>> From: kenwood-bounces at mailman.qth.net
>>>> [mailto:kenwood-bounces at mailman.qth.net]On Behalf Of Mark
>>>> Sent: Saturday, December 31, 2011 7:48 PM
>>>> To: kenwood at mailman.qth.net
>>>> Subject: [Kenwood] Kenwood TS-850
>>>> Importance: High
>>>>
>>>>
>>>> Hello all! My name is Mark, W4TGB.
>>>>
>>>> I own a highly reliable TS-850 that has just developed a power
>>>> output issue.
>>>>
>>>> At somewhat random times, when I key the transmitter in RTTY or
>>>> other full
>>>> carrier mode, the output power will go to full output and then drop
>>>> off to
>>>> nearly zero within about 3 seconds and then back to full power.
>>>>
>>>> In some cases, the rig will go to full power, drop to near zero and
>>>> then
>>>> back to full power followed by another drop to near zero and then to
>>>> full
>>>> power... repeat...
>>>>
>>>> Has anyone else seen this issue? Any thoughts on a repair?
>>>>
>>>> Thank you,
>>>> Mark
>>>> W4TGB
>>>>
>>>>
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>>
>>
>> ______________________________________________________________
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